Tamping machine



Oct. 1, 1935.

c. JACKSON TAMPING MACHINE Filed Dec. 12, 1927 2 SheetsSheet 1 INVENTOR c/da for /rs on BY P W1? Oct. 1/1935.

c. JACKSON TAMPING MACHINE Filed Dec. 12, 1927 2 Sheets-Sheet 2 IN VENT OR (om WW Jaflgarjly 6% I ATTORNEY5" Patented Oct. 1, 1935 UNITED STATES PATENT oE icE 2,015,899 TAMPING mom Corwiii Jackson, Chicago, Ill. Application December 12, 192 1, Serial No. ceases 7 Claims.

The main objects of this invention are:

First, to provide a tamping machine which is well adapted for use in tamping concrete dams, walls, roadbeds and the like.

5 Second, to provide an improved tamping machine which enables the accomplishment of a large amount of labor with a minimum of effort and is highly desirable for use in relatively dry mixes.

in Third, to provide an improved tamping machine of the class described which is very effective in minimizing voids and air pockets and in drawing excess water to the surface.

Objects pertaining to details and economies of 15 my invention will definitely appear from the description to follow. The invention is defined in the claims.

A structure embodying the features of my invention is ole ly illustrated in the accompanying drawings, inwhich:

Fig. 1 is a side elevation of my improved tamping machine, a portion of one of the sidewalls of the tamping shoe being broken away to show structural details.

25 Fig. 2 is a vertical section on line 2-2 of Fig. 1

with parts of the motor housing broken away to show structural details.

Fig. 3 is a plan view of the motor housing. Fig. 4 is a side elevation of a modified form or 80 embodiment of my invention.

In the embodiment illustrated in Figs. 1, 2 and 3 my improved tamping machine comprises a shoe I of substantial dimensions provided with side walls 2. Projecting upwardly from the shoe are 35 spaced standards 3 arranged in uniform relation to the center of the shoe.

.I provide a motor housing 4 adapted to house a motor, preferably an electric motor, which has a shaft 5 provided with an unbalancing weight 6 so that as the shaft revolves a rapid vibrating motion is imparted to the housing. This housing has laterally projecting arms I rigidly secured to the standards 3 so that the shoe is vibratedwiththe 45 housing. The housing has upwardly projecting spaced ears 8 adapted to receive the cushioning disk 9 by which the handle pivot I is supported.

The handle II is provided with a downwardly projecting shank l2 disposed between the ears to 50 receive the pivot 9.

This shank has laterally projecting arms l3 ying buffers I4 adapted to engage the arm I, thereby limiting the pivotal movement of the handle and shoe relative to each other. The arms 5 I have enlargements IS in opposite relation to the builers i4. Projecting flanges H are provided for securing the standards 3 thereto.

In the modification shown in Fig. 4 the shoe I6 is of channel cross section and is provided with upwardly projecting standards I1 at the ends thereof. The motor housings l8 are mounted on these standards and have motors housed therein provided with shafts having unbalancing weights as in the structure shown in Figs. 1,.2 and 3.

The handle IS in this embodiment is connected 10 to the standard by means of springs having a general S-shape so that the vibration on the handle is minimized.

The side walls on the shoe, while not an essential for certain classes of work, are highly desirable-when used in tamping concrete as the shoe, unless manipulated very skillfully, tends to bury itself in the concrete and it is then diillcult to withdraw. However, with the side walls the shoe does'not load up and can be readily withdrawn. 20

The vibrating means is such that the shoe is rapidly vibrated and when pressed on the surface of concrete appears to have the action of a diaphragm, alternately compressing and pulling by forming a vacuum between the plate and material being compacted. This serves to agitate the plastic mass to a considerable depth; in fact,

I have observed vibration or agitation several feet below the surface of the mass. This quickly compacts the mass and eliminates voids and air pockets and seems to draw the excess water to the surface.

I have illustrated and described my improvements in two embodiments which I have found very practical. I have not attempted to illustrate 85 or describe other embodiments or adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt my improvements as ,may be desired.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a structure of the class described, the combination of a tamping shoe provided with side walls, spaced standards mounted on said shoe to project upwardly therefrom, a motor housing having spaced upwardly projecting pivot ears and provided with oppositely projecting arms secured to said standards, a motor disposed in said housing and provided with a shaft having an unbalancing weight, a horizontally disposed handle provided with a shank disposed between said ears, resilient cushion members arranged within said pivot ears, and a pivot for said handle supported by said cushion members, said shank having opl positely projecting arms provided with buffers adapted to coact with said arms on said motor housing to limit the relative pivotal movement of the handle and motor housing.

2. In a structure of the class described, the combination of a tamping shoe provided with side walls, spaced standards mounted on said shoe to project upwardly therefrom, a motor housing secured to said standards, a motor disposed in said housing and provided with a shaft having an unbalancing weight, a handle provided with a shank disposed between said ears, resilient cushion members arranged within said pivot ears, and a. pivot for said handle supported by said cushion members.

3. In a structure of the class described, the combination of a tamping shoe, a motor housing mounted centrally of said shoe, said motor housing having spaced upwardly projecting pivot ears, a motor disposed in said housing and provided with a shaft having an unbalancing weight, a horizontally disposed handle provided with a shank disposed between said ears, resilient cushion members arranged within said pivot ears, a

pivot for said handle supported by said cushion members, and means for limiting the relative pivotal movement of said handle and shoe.

4. In a structure of the class described, the combination of a tamping shoe, a motor Housing mounted centrally of said shoe, said motor housinghaving spaced upwardly projecting pivot ears, a motor disposed in said housing and provided with a shaft having an unbalancing weight, a horizontally disposed handle provided with a shank disposed between said ears, resilient cushion members arranged within said pivot ears, and

a pivot for said handle supported by said cushion 5 members.

5. In a structure of the class described, the combination of a tamping shoe, a motor housing mounted on said shoe, a motor disposed in said housing and provided with a shaft having an unbalancing weight, a handle pivotally connected to said housing, and means for limiting the relative pivotal movement of said handle and shoe.

6. In a machine for working cement concrete, the combination of a vibrating means comprising a motor having an unbalancing weight, a shoe rigidly connected to said vibrating means and capable of supporting the machine when applied to a mass of concrete to be worked, and a handle for manually manipulating said shoe upon the mass of concrete to be worked and presenting it in various positions thereto.

'7. In a machine for working cement concrete, the combination of a vibrating means, a shoe connected to said vibrating means to be vibrated thereby and capable of supporting the machine when applied to a mass of concrete to be worked, and a handle for manually manipulating said shoe upon the mass of concrete to be worked and presenting it in various positions thereto.

CORWILL JACKSON. 

